{{define "menu"}}
<nav class="navbar navbar-default">
  <div class="container">
    <div class="navbar-header">
      <a class="navbar-brand" href="#" onClick="history.back()">Back</a>
    </div>
    <div class="collapse navbar-collapse">
      <ul class="nav navbar-nav">
        {{block "menu_content" .}} {{end}}
      </ul>
    </div>
  </div>
</nav>
{{ end }}